Norton sucks anyway.

You can get better (and free) complete system scans through Trend Micro's free online scanner. That and Spybot Search & Destroy (also free) together will kill about 98% of the shit you can pick up. You can take it up to 99.9% by getting your hands on the (free free free) CWShredder application. Those three things combined have only failed to completely clean any system I've gone into in very very rare circumstances.

And, they don't imbed themselves into every orifice of your computer, causing rectal bleeding and ass herpes when you try to remove them (like Norton).